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Showing 1–24 of 335 matching trials from the live ClinicalTrials.gov search.
Local D1 index available.
Filters: Intervention: Letrozole (Femara) Clear all
Completed No phase listed Observational Results available

RW Treatment Patterns and Outcomes in Postmenopausal HR+/HER2- mBC Patients Treated With Palbociclib Plus Letrozole as Initial Endocrine Therapy at Community Oncology Practices in the U.S.

NCT04460898
View directory record Official record
Conditions
Breast Cancer
Interventions
Not listed
Lead sponsor
Pfizer
Industry
Eligibility
18 Years and older · Female only
Enrollment
195 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Oct 3, 2024 · Synced Sep 17, 2026, 5:01 AM EDT
Completed Phase 1 Interventional Accepts healthy volunteers Results available

Pharmacokinetics and Hepatic Safety of EGCG

NCT04177693
View directory record Official record
Conditions
Uterine Fibroids
Interventions
Epigallocatechin gallate (EGCG), Clomiphene Citrate, Letrozole
Dietary Supplement · Drug
Lead sponsor
Yale University
Other
Eligibility
18 Years to 40 Years · Female only
Enrollment
39 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020 – 2022
U.S. locations
1
States / cities
Baltimore, Maryland
Source: ClinicalTrials.gov public record
Updated Jun 4, 2023 · Synced Sep 17, 2026, 5:01 AM EDT
Terminated Phase 3 Interventional

Ribociclib vs. Palbociclib in Patients With Advanced Breast Cancer Within the HER2-Enriched Intrinsic Subtype

NCT05207709
View directory record Official record
Conditions
Metastatic Breast Cancer
Interventions
Ribociclib + Letrozole OR Fulvestrant, Palbociclib + Letrozole OR Fulvestrant, Paclitaxel +/- Tislelizumab
Drug
Lead sponsor
SOLTI Breast Cancer Research Group
Other
Eligibility
18 Years and older
Enrollment
61 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2022 – 2026
U.S. locations
26
States / cities
Clearwater, Florida • Coral Gables, Florida • Hollywood, Florida + 22 more
Source: ClinicalTrials.gov public record
Updated Jun 24, 2026 · Synced Sep 17, 2026, 5:01 AM EDT
Terminated Phase 1 Interventional

RO4929097 and Letrozole in Treating Post-Menopausal Women With Hormone Receptor-Positive Stage II or Stage III Breast Cancer

NCT01208441
View directory record Official record
Conditions
Estrogen Receptor-positive Breast Cancer, HER2-negative Breast Cancer, Progesterone Receptor-positive Breast Cancer, Stage II Breast Cancer, Stage IIIA Breast Cancer
Interventions
letrozole, gamma-secretase/Notch signalling pathway inhibitor RO4929097, therapeutic conventional surgery, breast biopsy, diagnostic laboratory biomarker analysis, pharmacological study
Drug · Procedure · Other
Lead sponsor
National Cancer Institute (NCI)
NIH
Eligibility
18 Years and older · Female only
Enrollment
28 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
Started 2010
U.S. locations
3
States / cities
Birmingham, Alabama • Pittsburgh, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Sep 29, 2013 · Synced Sep 17, 2026, 5:01 AM EDT
Terminated Phase 1Phase 2 Interventional

Palbociclib in Estrogen Receptor Positive (ER+) Human Epidermal Growth Factor Receptor 2 Positive (HER2+) Metastatic Breast Cancer

NCT03709082
View directory record Official record
Conditions
HER2-positive Breast Cancer, Breast Cancer Metastatic
Interventions
Palbociclib 75mg, Letrozole 2.5mg, T-DM1, Palbociclib 100mg, Palbociclib 125mg, Palbociclib
Drug
Lead sponsor
University of Kansas Medical Center
Other
Eligibility
18 Years and older · Female only
Enrollment
3 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2021
U.S. locations
5
States / cities
Kansas City, Kansas • Overland Park, Kansas • Kansas City, Missouri + 1 more
Source: ClinicalTrials.gov public record
Updated Mar 4, 2024 · Synced Sep 17, 2026, 5:01 AM EDT
Recruiting Phase 2 Interventional

Endocrine Treatment Alone for Elderly Patients With Estrogen Receptor Positive Operable Breast Cancer and Low Recurrence Score

NCT02476786
View directory record Official record
Conditions
Breast Cancer, Cancer of Breast, Breast Neoplasms, Cancer of the Breast
Interventions
FACT-B, Goserelin, Anastrozole, Exemestane, Fulvestrant, Tamoxifen, Archived tissue collection
Behavioral · Drug · Other
Lead sponsor
Washington University School of Medicine
Other
Eligibility
70 Years and older · Female only
Enrollment
50 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2032
U.S. locations
1
States / cities
St Louis, Missouri
Source: ClinicalTrials.gov public record
Updated Jul 26, 2026 · Synced Sep 17, 2026, 5:01 AM EDT
Active, not recruiting Phase 2 Interventional

A Phase II, Two-Arm Study of Everolimus and Letrozole, +/- Ribociclib (Lee011) in Patients With Advanced or Recurrent Endometrial Carcinoma

NCT03008408
View directory record Official record
Conditions
Recurrent Endometrial Carcinoma, Recurrent Endometrial Endometrioid Adenocarcinoma, Refractory Endometrial Carcinoma, Refractory Endometrial Endometrioid Adenocarcinoma, Stage III Uterine Corpus Cancer AJCC v8, Stage IIIA Uterine Corpus Cancer AJCC v8, Stage IIIB Uterine Corpus Cancer AJCC v8, Stage IIIC Uterine Corpus Cancer AJCC v8, Stage IIIC1 Uterine Corpus Cancer AJCC v8, Stage IIIC2 Uterine Corpus Cancer AJCC v8, Stage IV Uterine Corpus Cancer AJCC v8, Stage IVA Uterine Corpus Cancer AJCC v8, Stage IVB Uterine Corpus Cancer AJCC v8
Interventions
Everolimus, Letrozole, Ribociclib
Drug
Lead sponsor
M.D. Anderson Cancer Center
Other
Eligibility
18 Years and older · Female only
Enrollment
90 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2028
U.S. locations
2
States / cities
Houston, Texas
Source: ClinicalTrials.gov public record
Updated May 21, 2026 · Synced Sep 17, 2026, 5:01 AM EDT
Terminated Phase 2 Interventional Results available

Ph II Letrozole + OSI-774 (Tarceva) in Post-menopausal, w/ ER and/or PR-positive Met Breast Cancer.

NCT00611715
View directory record Official record
Conditions
Breast Cancer
Interventions
erlotinib hydrochloride, letrozole, fluorescence in situ hybridization, immunohistochemistry staining method, laboratory biomarker analysis
Drug · Genetic · Other
Lead sponsor
Vanderbilt-Ingram Cancer Center
Other
Eligibility
18 Years and older · Female only
Enrollment
48 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2003 – 2008
U.S. locations
9
States / cities
Macon, Georgia • Hopkinsville, Kentucky • Paducah, Kentucky + 5 more
Source: ClinicalTrials.gov public record
Updated Aug 8, 2012 · Synced Sep 17, 2026, 5:01 AM EDT
Withdrawn Early Phase 1 Interventional

Neoadjuvant Study of Abemaciclib, Durvalumab, and an Aromatase Inhibitor Early Stage Breast Cancer

NCT04088032
View directory record Official record
Conditions
Breast Cancer Female, Locally Advanced Breast Cancer, Hormone Receptor Positive Malignant Neoplasm of Breast
Interventions
Abemaciclib, durvalumab and aromatase inhibitor
Drug
Lead sponsor
Alison Stopeck
Other
Eligibility
18 Years and older · Female only
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019 – 2020
U.S. locations
1
States / cities
Stony Brook, New York
Source: ClinicalTrials.gov public record
Updated Jul 15, 2020 · Synced Sep 17, 2026, 5:01 AM EDT
Completed Phase 2 Interventional Results available

Study of 2 Ribociclib Doses in Combination With Aromatase Inhibitors in Women With HR+, HER2- Advanced Breast Cancer

NCT03822468
View directory record Official record
Conditions
Breast Cancer
Interventions
Ribociclib, Anastrozole, Letrozole, Goserelin
Drug
Lead sponsor
Novartis Pharmaceuticals
Industry
Eligibility
18 Years to 100 Years · Female only
Enrollment
376 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019 – 2024
U.S. locations
14
States / cities
Mobile, Alabama • Greenbrae, California • Longmont, Colorado + 11 more
Source: ClinicalTrials.gov public record
Updated Oct 15, 2025 · Synced Sep 17, 2026, 5:01 AM EDT
Completed Phase 1Phase 2 Interventional Results available

Phase I/II Trial of Letrozole and Sorafenib in Post-Menopausal Hormone-Receptor + Breast Cancer

NCT00634634
View directory record Official record
Conditions
Metastatic Breast Cancer
Interventions
Sorafenib, Letrozole
Drug
Lead sponsor
Rutgers, The State University of New Jersey
Other
Eligibility
18 Years and older · Female only
Enrollment
52 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2008 – 2023
U.S. locations
4
States / cities
Washington D.C., District of Columbia • Atlanta, Georgia • New Brunswick, New Jersey + 1 more
Source: ClinicalTrials.gov public record
Updated Nov 8, 2023 · Synced Sep 17, 2026, 5:01 AM EDT
Recruiting Phase 2 Interventional

RESOLVE: Abemaciclib + Letrozole +/- Metformin or Gedatolisib in Endometrial Cancer

NCT03675893
View directory record Official record
Conditions
Endometrial Cancer
Interventions
Letrozole, Abemaciclib, LY3023414, Metformin, Gedatolisib
Drug
Lead sponsor
Dana-Farber Cancer Institute
Other
Eligibility
18 Years and older · Female only
Enrollment
110 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2031
U.S. locations
3
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Jun 21, 2026 · Synced Sep 17, 2026, 5:01 AM EDT
Completed Phase 3 Interventional Results available

Letrozole in Preventing Cancer in Postmenopausal Women Who Have Received 4-6 Years of Hormone Therapy for Hormone Receptor-Positive, Lymph Node-Positive, Early-Stage Breast Cancer

NCT00553410
View directory record Official record
Conditions
Breast Cancer
Interventions
Letrozole
Drug
Lead sponsor
ETOP IBCSG Partners Foundation
Network
Eligibility
18 Years to 120 Years · Female only
Enrollment
4,884 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2007 – 2019
U.S. locations
2
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Aug 31, 2026 · Synced Sep 17, 2026, 5:01 AM EDT
Completed Phase 2 Interventional Results available

A Phase II Randomized Study Evaluating the Biological and Clinical Effects of the Combination of Palbociclib With Letrozole as Neoadjuvant Therapy in Post-Menopausal Women With Estrogen-Receptor Positive Primary Breast Cancer

NCT02296801
View directory record Official record
Conditions
Breast Cancer, Breast Carcinoma, Breast Tumors
Interventions
Letrozole, palbociclib
Drug
Lead sponsor
NSABP Foundation Inc
Network
Eligibility
18 Years and older · Female only
Enrollment
307 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2019
U.S. locations
19
States / cities
Long Beach, California • Miami, Florida • Decatur, Illinois + 13 more
Source: ClinicalTrials.gov public record
Updated Jan 12, 2022 · Synced Sep 17, 2026, 5:01 AM EDT
Terminated Phase 2 Interventional Results available

Study of BMS-754807 Combined With Letrozole or BMS-754807 Alone in Patients With Hormone Receptor-Positive Breast Cancer and Resistance to Non-Steroidal Aromatase Inhibitors

NCT01225172
View directory record Official record
Conditions
Breast Cancer
Interventions
BMS-754807, letrozole
Drug
Lead sponsor
Bristol-Myers Squibb
Industry
Eligibility
18 Years and older · Female only
Enrollment
77 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010 – 2014
U.S. locations
21
States / cities
Birmingham, Alabama • Scottsdale, Arizona • San Diego, California + 14 more
Source: ClinicalTrials.gov public record
Updated Aug 10, 2020 · Synced Sep 17, 2026, 5:01 AM EDT
Active, not recruiting Phase 2 Interventional Results available

Pre-Operative Window of Adjuvant Endocrine Therapy to Inform RT Decisions in Older Women With Early-Stage Breast Cancer

NCT04272801
View directory record Official record
Conditions
Breast Cancer Female
Interventions
tamoxifen, letrozole, anastrozole, or exemestane, Patient reported outcomes
Drug · Behavioral
Lead sponsor
Shayna Showalter, MD
Other
Eligibility
65 Years and older · Female only
Enrollment
84 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2026
U.S. locations
2
States / cities
Charlottesville, Virginia • Richmond, Virginia
Source: ClinicalTrials.gov public record
Updated Oct 21, 2025 · Synced Sep 17, 2026, 5:01 AM EDT
Completed Phase 2 Interventional Results available

Reversing Hormone Resistance in Advanced Breast Cancer With Pazopanib

NCT01466972
View directory record Official record
Conditions
Breast Cancer, Breast Neoplasm
Interventions
Pazopanib
Drug
Lead sponsor
Hope Rugo, MD
Other
Eligibility
18 Years and older · Female only
Enrollment
30 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2012 – 2019
U.S. locations
1
States / cities
San Francisco, California
Source: ClinicalTrials.gov public record
Updated Jul 7, 2020 · Synced Sep 17, 2026, 5:01 AM EDT
Active, not recruiting Phase 4 Interventional

Roll-over Study to Allow Continued Access to Ribociclib

NCT05161195
View directory record Official record
Conditions
Metastatic Breast Cancer
Interventions
Ribociclib, Letrozole, Anastrozole, Goserelin, Tamoxifen, Fulvestrant
Drug
Lead sponsor
Novartis Pharmaceuticals
Industry
Eligibility
18 Years to 100 Years
Enrollment
134 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2022 – 2030
U.S. locations
16
States / cities
Chandler, Arizona • Fayetteville, Arkansas • Beverly Hills, California + 13 more
Source: ClinicalTrials.gov public record
Updated Jun 22, 2026 · Synced Sep 17, 2026, 5:01 AM EDT
Completed Phase 2Phase 3 Interventional Results available

Trametinib in Treating Patients With Recurrent or Progressive Low-Grade Ovarian Cancer or Peritoneal Cavity Cancer

NCT02101788
View directory record Official record
Conditions
Borderline Ovarian Serous Tumor, Micropapillary Serous Carcinoma, Ovarian Serous Adenocarcinoma, Primary Peritoneal Serous Adenocarcinoma, Recurrent Ovarian Low Grade Serous Adenocarcinoma, Recurrent Primary Peritoneal Serous Adenocarcinoma
Interventions
Letrozole, Paclitaxel, Pegylated Liposomal Doxorubicin Hydrochloride, Quality-of-Life Assessment, Questionnaire Administration, Tamoxifen Citrate, Topotecan, Trametinib Dimethyl Sulfoxide
Drug · Other
Lead sponsor
National Cancer Institute (NCI)
NIH
Eligibility
18 Years and older · Female only
Enrollment
260 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2014 – 2025
U.S. locations
488
States / cities
Huntsville, Alabama • Anchorage, Alaska • Fairbanks, Alaska + 310 more
Source: ClinicalTrials.gov public record
Updated Aug 3, 2026 · Synced Sep 17, 2026, 5:01 AM EDT
Recruiting Phase 1Phase 2 Interventional

First-in-Human Study of Tersolisib (STX-478) as Monotherapy and in Combination With Other Antineoplastic Agents in Participants With Advanced Solid Tumors

NCT05768139
View directory record Official record
Conditions
Breast Cancer, Solid Tumors, Adult
Interventions
STX-478, Fulvestrant, Ribociclib, Palbociclib, Letrozole, Anastrozole, Exemestane, Tamoxifen, Abemaciclib, Imlunestrant, Metformin
Drug
Lead sponsor
Eli Lilly and Company
Industry
Eligibility
18 Years and older
Enrollment
880 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2030
U.S. locations
28
States / cities
Los Angeles, California • San Francisco, California • Aurora, Colorado + 22 more
Source: ClinicalTrials.gov public record
Updated Jul 6, 2026 · Synced Sep 17, 2026, 5:01 AM EDT
Completed Phase 2 Interventional Results available

Study of MEDI-573 Plus Standard Endocrine Therapy for Women With Hormone-sensitive Metastatic Breast Cancer

NCT01446159
View directory record Official record
Conditions
Hormone-sensitive, HER-2 Negative Metastatic Breast Cancer
Interventions
MEDI-573, Aromatase Inhibitor
Drug
Lead sponsor
MedImmune LLC
Industry
Eligibility
18 Years to 99 Years · Female only
Enrollment
188 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2011 – 2019
U.S. locations
34
States / cities
Scottsdale, Arizona • Bakersfield, California • Pleasant Hill, California + 28 more
Source: ClinicalTrials.gov public record
Updated Jun 1, 2020 · Synced Sep 17, 2026, 5:01 AM EDT
Completed Phase 3 Interventional Results available

A Study of Palbociclib (PD-0332991) + Letrozole vs. Letrozole For 1st Line Treatment Of Postmenopausal Women With ER+/HER2- Advanced Breast Cancer (PALOMA-2)

NCT01740427
View directory record Official record
Conditions
Breast Neoplasms
Interventions
PD-0332991, Letrozole, Placebo
Drug
Lead sponsor
Pfizer
Industry
Eligibility
18 Years and older · Female only
Enrollment
666 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2013 – 2023
U.S. locations
136
States / cities
Bellflower, California • Beverly Hills, California • Fullerton, California + 83 more
Source: ClinicalTrials.gov public record
Updated Nov 13, 2024 · Synced Sep 17, 2026, 5:01 AM EDT
Recruiting Phase 2 Interventional

Compare Adjuvant Monotherapy With Endocrine or Accelerated Partial Breast Irradiation After Lumpectomy

NCT05472792
View directory record Official record
Conditions
Breast Cancer, Quality of Life
Interventions
Accelerated Partial Breast Irradiation (APBI), tamoxifen, anastrozole, exemestane, letrozole, fulvestrant, toremifene
Radiation · Drug
Lead sponsor
UNC Lineberger Comprehensive Cancer Center
Other
Eligibility
65 Years and older · Female only
Enrollment
90 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2022 – 2032
U.S. locations
1
States / cities
Chapel Hill, North Carolina
Source: ClinicalTrials.gov public record
Updated May 25, 2026 · Synced Sep 17, 2026, 5:01 AM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

Fasting Study of Letrozole Tablets 2.5 mg and Femara® Tablets 2.5 mg

NCT00648063
View directory record Official record
Conditions
Healthy
Interventions
Letrozole Tablets 2.5 mg, Femara® Tablets 2.5 mg
Drug
Lead sponsor
Mylan Pharmaceuticals Inc
Industry
Eligibility
40 Years and older · Female only
Enrollment
24 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2005 – 2006
U.S. locations
1
States / cities
Miami, Florida
Source: ClinicalTrials.gov public record
Updated Nov 30, 2009 · Synced Sep 17, 2026, 5:01 AM EDT